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1 149 



TERTIARY FAUNA OF FLORIDA 



States by B. prima Aldrich (Bull. Pal., ii., p. 181, pi. 5, figs. 3, 3a, 1897) of 

 Wood's Bluff and in the Claibornian by B. Dalli Cossmann (as Montacuta, 

 Notes Compl., p. 12, pi. i, figs. 13-14, 1894). No species have so far been 

 collected from the Lower Oligocene, though they will doubtless be found on 

 further exploration of the Chipola beds. 



Bornia scintillata n. sp. 

 Plate 49, Figure 10. 



Eocene of the Claibornian sands, Claiborne, Alabama ; Burns. 



Shell small, subtrigonal, subeciuilateral, polished, finely, sharply radially 

 grooved, the grooving of the middle of the disk finer and closer than that to- 

 wards the ends; the beaks moderately elevated, nearly smooth, the larval shell 

 small, distinct ; hinge armature feeble ; the left posterior lamina small, feeble, 

 short ; anteriorly the " hooks" of the two anterior laminae distinct, simulating 

 cardinals, the lateral portions nearly obsolete ; the grooving of the exterior 

 faintly visible interiorly towards the anterior end but not crenulating the basal 

 margin ; muscular impressions narrow, feeble ; basal margin entire. Lon. 

 3.75, alt. 3.0, diam. 1.5 mm. 



A single left valve of this very distinct species was obtained. From B. 

 prima Aldrich, it differs by being grooved, not plicated, in the absence of the 

 punctuation which covers the surface in B. prima, and in the much more profuse 

 and finer sculpture. 



Bornia plectopygia n. sp. 

 Plate 49, Figure 9. 



Eocene of the Claiborne sands, Claiborne, Alabama ; Burns. 



Shell small, short, rounded ovate, polished, smooth to the eye, except for 

 incremental lines and about three faint radial plications on the posterior basal 

 half; beak low, distinct; hinge armature feeble, the distal laminse obsolete, 

 the hooks of the left anterior laminae perceptible but not prominent; anterior 

 side short, rounded, posterior side produced downward and backward, the 

 margin indented by the radial furrows, elsewhere entire ; scars obscure. Lon. 

 4.5, alt. 4.0, diam. 2.0 mm. 



A single left valve of this species was collected which though somewhat 

 imperfect cannot be confounded with either of the other species from this 

 horizon. There is a faint microscopic radial striation on the surface, a sulcus 

 for the ligament, and a faint excavation for the resilium. 



